Yahoo's Mayer says sleep blunder 'unfortunate'

Yahoo CEO Marissa Mayer has apologized for arriving late at a dinner with advertisers she was due to attend at the Cannes advertising festival after falling asleep, saying the incident was "unfortunate".

In an interview with Bloomberg, Mayer said she felt "really badly" for turning up hours late. The apology came after the Wall Street Journal, citing sources, said on Monday that Mayer was so late to the private dinner Interpublic Group had arranged that its CEO Michael Roth and other attendees left before she arrived.

"I feel like our ad story is really resonating and I'm really quite happy with it," Mayer said in the exclusive interview. "I think the dinner is unfortunate how much attention it's gotten. I was late. I apologized to IPG at the time and in no way meant for it to be a slight to them."